Problem is Minun can't come in safely against much of anything, even a Milotic Surf with a small amount of SpA will 2HKO it with SR (Not mentioning Haze), which is so common it's practically a common battle condition, so unless someone is stupid enough to try to stat up, Encore just means you're going to die.
It's really not as difficult as you're making it out to be. If you want to bring Minun in against Milotic, that's your own fault since it's obviously not the best thing to set up on. Also, FYI:
263 Atk vs 206 Def & 324 HP (95 Base Power): 130 - 154 (40.12% - 47.53%)
That's the standard 108 SpA Milotic (I'm not completely sure if the EVs have changed or something), which isn't even guaranteed a 2HKO with Surf and SR. And seeing as I recommended carrying a Rapid Spinner, which IMO seem to be a lot more common in UU than in OU, SR shouldn't always be assumed. Without SR, it isn't getting a 2HKO at all.
Anyways, it's not even a good idea to bring Minun into Milotic. Just bring it in against a wall and it's not that difficult to Encore. Also "unless someone is stupid enough to try to stat up"...dude, you're supposed to predict and bring Minun in as they stat up and Encore it from there. Of course no one's going to stat up in Minun's face. Stat ups aren't the only thing he can Encore as well, any supporting move would work just fine (besides something like Haze). Eg. come in on Altaria using Roost, Encore it, and then with your Focus Sash, you're free to NP and Pass.













